Before the Universe — Frederik Pohl

Collection of classic stories by collaborators C. M. Kornbluth and Frederik Pohl. Introduction and Afterword by Pohl, plus these stories: Mars-Tube (1941); Trouble in Time (1940); Vacant World (1940); Best Friend (1941); Before the Universe (1940); Nova Midplane (1940); The Extrapolated Dimwit (1942).